Crankshaft grinding machine



Nov. 18, 1947. usci- 2,431,054

CRANK SHAFT GRINDING MACHINE Filed March 28, 1945 4 Sheets-Sheet 1 INVENTOR. FREDERICK M. LEUSGH FIGURE l.

ATTDRN EYE I Nov. 18,1947. r v F. M. LEUSCH 3 ,05

7 CRANK SHAFT GRINDING MACHINE m I Filed March 28, 1945 4 Sheets-Sheet 2 INVENTOR. FREDERICK M. LEUSCH ATTORNEYS Nov 18, 1947. F. M; LEUSCH 2,431,054

A CRANK SHAFT GRINDI NG MACHINE Eiled March 28, 1945. 4 Sheets-Sheet s H 1pm.

FIGURES INVENTOR. FREDERICK M.LEUSCH A'ITDRNEYS Nov..18,1947. F, M, LEUSCH 2,431,054

CRANK SHAFT GRINDING MACHINE Filed March 28, 1945 4'Sheets-Sheet 4 ATI'U R N EYS 3 In E IO g Q m i \Q. eu r INVENTORJ m FREDERICK M. LEUSCH m 3 BY 0 O Patented Nov. 18, 1947 U NITED S TATES PAT EN OFFICE CRANKSHAFT' GRINDING MACHINE Fredei'ickMr-Leusch, Lemmon, soak.

Application March 28, 1945,-'Serial No. 585 5227 The invention relates to grinding machines, and more especially to crankshaft grinders.

Theprimary object or the invention is the provision'of amachine of this character, wherein the construction thereof involves refinements over the subject-matter of Letters Patent No. 2,340,602, issued February 1,19%, and more particularly in the suspension or the grinding wheel beneath the shaft being ground thereby, and supported by thelatter, the machine beingcomplete in itself andnot a lathe attachmentyas perthe Letters Patent above identified.

Another object of Y the invention is'the provision of a-machine of this charactenwherein true and perfect contact can be had between the grinding wheel and v the work I operated upon from the undersideof the-latter, while the grinding operation can be regulated to a determined point with respect to the .work this being-automatioa1ly controlled,.and inthis way relieving the attendant from this task.

A furtheraobject. of theinvention is the provision of a machine of this characterpwherein the construction thereof is unique and novel, requiring the attention of only a single operator in the handlingof the machine, the adjustment of the latter being accomplished at one sidethereof.

A still further object of the invention is the provision of amachine ofthis character, which is simple inconstruction, thoroughly reliable and eificient inoperation, automatic in the working thereof, readilyand easilyadjusted, assuring accuracy and trueness in the grinding operation, and inexpensive to manufacture.

With these and other objectsin view, the invention consists in the=featuresof construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings, which show the preferred embodiment ofthe invention, and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is a front elevation of themachine constructed in accordance with the invention.

Figure 2 is a top plan View thereof.

Figure 3 is a. sectional view taken on the. line 3-3 of" Figure llooking in the direction of the arrows.

Figure 4' is a view similar to'Figure 3 showing the parts in adiiferent adjusted position.

Similar reference characters indicate corresponding'parts throughout the several views in the drawings.

Referringto the drawings in detail, .A designates generally the'machine inits entirety,

2 constructed. in accordancewith the invention, and comprisesa bed I 0, which is of substantially rectangular formation inplan, and is provided at the top thereof with'front, intermediate and rear track rails- I I, I-Z'and i3, respectively, these being spaced apart -and-are disposed 1 longitudinally of the bed throughout the extent thereof.

Fixedly arranged at'oneendof thebed lil'in overlying.relationtothe rails H and I2, is a stationaryhead stock t4;:and'ani adjustable tail stock [5 is mounted: on these railsl l :and 12 to be located atthe other end'of the bed forsliding movementrelative; to the head: stock. The head stock .l4 -is-i1lustra ted as being'provided witha four-jaw chuck lt'which receives and centers one end of a crankshaft 1'! to 'bereground in the machine. The tail stock 15 isprovided with the conventional hand-operated centeringshank ['8 and latching .device I-9 forhold-ing the opposite end. of the crankshaft .11 during the regrindingoperation.

After the crankshaftll has-been mounted in the machinewA between the head and tail stocks in the'above manner,=it:may'be rotated at. se lected--speed-tby any suitable drive mechanism. There has been illustrated, however,- a :belt pulley 20. fittedtto the shaft zl .ofthe. head stock l4 on which an endless belt-22 from anelectric motor or other power source 23 maybe trained.

Trackinglthe rai ls 1!,1'2 andi3, is a movable carriage'havingthehorizontal table 24 formed with a rear step: area .25'=whichv saddles the front rail ,the latter at-the under side of its'ball portion ZS-being provided with longitudinally directed-rack teeth 21-with-which meshes a rack gear 28 fixed to the rear end of a turning shaft 29. This shaft 29 is journaled-next to thegear 28 in the area' 25,whi1e neXt to-itsfront end the said shaft is fitted in a bearing Bil-rising vertically from the for-ward endof the table2-4, and such front end of the shaft has fixed thereto a hand wheel-.3! sothat the carriage can be adjustedonthe bedv lil of the machine A,=as-will be clearly apparent'from Figures 2,3 and 4, of the drawings.

Formedon .the steparea 25 are spaced upstanding .bearingsrfiz in wh-ich are held belt pulleys '33'keyed or spline'd. at 34 for sliding movement On apower .shaftc35-journaled in the said bearings .32 and. also in bearings 36.0n the bed 10. Between the bearingstlis a double reverse forked rocker link-31, whichhas the lowermost, fork slidably and pivotally supported bythe shaft 35, while .theuppermost fork of this link carries a driven shaft..38 having connected thereto a verwhich in its front fork 40 is journaled the axle 4| of a grinding wheel 42. The wheel 42 is adapted to underlie the work to be operated upon thereby, The axle at opposite sides of the wheel 62 fixed thereto has secured thereon pulley wheels 43 over which are trained the belts 44, these being also trained over companion belt pulleys 45 on the driven shaft 33. The shaft 38 has fitted thereto the pulleys 4'6 having belt connections 41 with the pulleys 33, and in this manner the wheel 42 is operated. The shaft 35, having the pulleys connected therewith, is powered in any suitable manner, a wheel 48 being provided for this purpose.

The arm 39 at its rear forked end 49 accommodates the rear end of a caliper arm 50, which is vertically swingable on the shaft 38, and is formed at its front end with a jaw terminal 5| to engage over the crankshaft pin 52, This arm 50 has swiveled thereto a co-related adjusting leg and nut 53 and 55, respectively, the leg 53 being pivoted at 55 to the arm 39, and in this manner the wheel 42 can be brought into a gauged relationship to the pin 52 of the crankshaft, there being an adjustable stop screw 56 carried by the arm 59 for engagement by the arm 35 to limit the displacement of the latter with respect to the arm 55.

By reason of the fact that both the arms 39 and 5B are pivoted for independent swinging movement, it is necessary to provide means for adjustably connecting these arms, if the peripher f the grinding wheel 42 is to be moved into 0 erative association with the crankshaft pin 52 to be ground, therefore, there has been provided the leg 53, nut 54, and set screw 55. However, When grinding the mains of the crankshaft ll, the arm 50, together with the leg 53, nut 54 and set screw 55, are not used, there being provided a saddle yoke 57 for this purpose, which is swiveled on the upper end of a vertically disposed adjusting screw 58, threaded at 59 in the table 2 1, and has fixed to its lowermost end beneath the latter a hand wheel 60 for adjustment thereof, This yoke 57 has formed on the limbs 6| thereof at their upper ends concaved seats 62 for the engagement therein of the axle 4| of the wheel 42, and in this manner the latter can be brought into contact with the crankshaft I! for the support thereof in this position for grinding operation thereon, which is best seen in Figure 4 of the drawings. The foregoing arrangement is used only when grinding the main bearings of the crankshaft l7, and enables the operator to make a perfect contact of the wheel 42 therewith at its underside.

In operation, the hand wheel 3! is actuated to position the carriage in confronting relation with the bearing to be reground.

The link 31 has fixed thereto a bracket 63 from which is suspended a weight 64 which is adapted to bring the arm 56 into contact with the selected bearing of the crankshaft l? to be reground, the jaw of the arm 50 being brought into overlying contact with the said hearing, as is best seen in Figure 3 of the drawings, and thereafter the wheel through adjustment of the arm 39 is brought into grinding position to such bearing. This wheel @2 will be limited in the grinding action by the stop screw 56, after set ting of the latter, the said wheel being regulated in its grinding action by the nut 54.

What is claimed is:

1. In combination with a lathe having a head stock and a tail stock for rotating a crankshaft having eccentric portions, a carriage member slidably mounted on said lathe for movement lengthwise thereof, supporting means on said carriage, a rocker link having bifurcated ends, one of said ends being pivoted on said supporting means, drivingpulleys on opposite sides of said rocker link and rotatably mounted on said supporting means, a, driving shaft rotatably mounted lengthwise on the lathe and slidably keyed through said pulleys for driving the same, an intermediate shaft rotatably mounted on the other end of said rocker link, intermediate driven pulleys secured to said intermediate shaft on opposite sides of said rocker link and aligned with said driving pulleys, belts connecting said aligned driving and driven pulleys, intermediate driving pulleys secured to said intermediate shaft adjacent said driven pulleys, a grinding arm having forked ends one of which is pivotally mounted on said intermediate shaft between the bifurcations of said rocker link, said grinding arm adapted to extend adjacent one side of the crankshaft, a stub shaft rotatably mounted in the other of said ends of said arm, a grinding wheel secured to said stub shaft intermediate the ends thereof for contacting one side of the crankshaft for grinding the same, terminal driven pulleys secured to the ends of said stub shaft and aligned with said intermediate driving pulleys, belts connecting said aligned intermediate driving and terminal driven pulleys, respectively, a caliper arm pivotally mounted on said intermediate shaft and between a forked end of said grinding arm on said intermediate shaft, said caliper arm terminating in a follower portion, said follower portion having a part offset from and parallel with said arm and connected to the same by a part perpendicular to both said arm and said offset part, said follower portion adapted to engage the crankshaft oppositely to said grinding wheel, a threaded member pivoted on said grinding arm and extending through said caliper arm, an adjusting nut engaging said caliper arm and adjustably mounted on said threaded member, a screw threaded in said caliper arm and abutting said grinding arm, said threaded member, adjusting nut and screw cooperating to adjust the angular relationship between said caliper arm and said grinding arm in accordance with the size of crankshaft therebetween and to maintain contact between said grinding wheel and the crankshaft, a bracket secured to said rocker link, a weighted means pivoted to said bracket for yieldably moving said rocker link toward the crankshaft thereby causing said follower portion to bear against said crankshaft whereby the periphery of said grinding wheel is rotatably held against the crankshaft during rotational and orbital movements of the same.

2. In combination with a lathe having a head stock and a tail stock for rotating a crankshaft having eccentric portions, a carriage member slidably mounted on said lathe for movement lengthwise thereof, supporting means on said carriage, a rocker link pivoted on said supporting means, a driving shaft rotatably mounted lengthwise on the lathe, an intermediate shaft rotatably mounted on the other end of said rocker link, means connected to said driving shaft and said intermediate shaft for driving the same, a grinding arm pivotally mounted on said intermediateshaft, a stub shaft rotatably mounted on the other end of said grinding arm, a grinding wheel secured to said stub shaft, means drivingly connecting said intermediate and said stub shafts, a caliper arm pivotally mounted on said intermediate shaft, said grinding arm and said caliper arm extending to opposite sides of the crankshaft, said caliper arm terminating in a follower portion, said follower portion having a part offset from and parallel with said arm and connected to the same by a part perpendicular to both said arm and said offset part, said follower portion adapted to engage the crankshaft oppositely to said grinding wheel, means associated with said grinding arm and said caliper arm for adjusting the distance between said follower portion and said grinding wheel to accommodate therebetween different sized crankshaft diameters, a bracket secured to said rocker link, a weighted means pivoted to said bracket for yieldably moving said rocker link toward the crankshaft thereby causing said follower portion to bear against said crankshaft whereby the periphery of said grinding wheel is rotatably held against the crankshaft during rotational and orbital movements of the same.

3. In combination with a lathe having a head stock and a tail stock for rotating a crankshaft having eccentric portions, a carriage member slidably mounted on said lathe for movement lengthwise thereof, supporting means on said carriage, a rocker link pivoted on said supporting means, a driving shaft rotatably mounted lengthwise on the lathe, an intermediate shaft rotatably mounted on the other end of said rocker link, means connected to said driving shaft and said intermediate shaft for driving the same, a grinding arm pivotally mounted on said intermediate 35 2,340,602

shaft, a stub shaft rotatably mounted on the other end of said grinding arm, a grinding wheel secured to said stub shaft, means drivingly connecting said intermediate and said stub shafts, a caliper arm pivotally mounted on said intermediate shaft, said grinding arm and said caliper arm extending to opposite sides of the crankshaft, said caliper arm terminating in a follower portion, said follower portion having a part offset from and parallel with said arm and connected to the same by a part perpendicular to both said arm and said offset part, said follower portion adapted to engage the crankshaft oppositely to said grinding wheel, means associated with said grinding arm and said caliper arm for adjusting the distance between said follower portion and said grinding wheel to accommodate therebetween different sized crankshaft diameters, means attached to said rocker link for yieldably moving said rocker link toward the crankshaft thereby causing said follower portion to bear against said crankshaft whereby the periphery of said grinding wheel is rotatably held against the crankshaft during rotational and orbital movements of the same.

FREDERICK M. LEUSCH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,071,882 Kremer Feb. 23, 1937 Leusch Feb. 1, 1944 2,349,108 Myers May 16, 1944 

